Double turntable



Nov. 3o, 1943, R a GAY 2,335,661

DOUBLE TURNTABLE Filed Aug. 16, 1940 Mu my u ulm 1N VENT OR. 1.92:, uf qff'ead M BYJ mj ATTORNEY.

- Referring now to Patented Nov. 3o, 194s t DOUBLE TURNTABLE Pal stesa. Gay, charlotte,r Mich., assignor to Wilcox-Gay Corporation, Charlotte, Mich., a

corporation of Michigan Application Augustvl, 1940, lSerial No. 352,838 s 4 claims. (ci. 2747-39) This invention relates to soundlrecording-and.

reproducing apparatusv and more particularly to a double turntable therefor, whereby sound recording and sound reproducing operations may -be performed simultaneously upon la single instrument.

'I'he present invention in its simplest form relates'to an additional turntable which may be mounted upon and secured to the principal turntable' of a recording and reproducing apparatus so that it may be operable therewith.

The object of this invention, therefore, is the provision in sound recording and/.or reproducing apparatus vof a double turntable which will permittwo simultaneous operations to be performed,

Another object of the present invention is the provision of an additional turntable which may Still another object of the present invention is 'the provision of means y,for simultaneously performing the reproducing and recording operation on sound recording and reproducingapparatus.

Other objects and uses of the present invention will in part be apparent, and in part-pointed vout in the following description and drawing in which: Fig. 1 is a view in perspective of a turntable arrangement of a sound recording andreproducing apparatus. Fig. 2 is a cross-sectional view therein on line -22 of Fig.' 1 looking in the direction of the arrows.

Figs. 1 and 2, I have here 'shown the turntable of a sound recording and reproducingapparatus of the'type described in my application, Serial No. 320,823, filed February 26,

The principal turntable 20 of the sound recording and reproducing apparatus is rotatably mounted upon a spindle 2|. The turntable 20 is driven in any suitable manner, as for -instance by the means described in my application, Serial No. 320,823, ,above mentioned. Thus any suitable motor or prime mover may be connected in any Suitable manner to the turntable. 20 to drive the same. Preferably the power connection between the motor and the turntable is a rubbertired idler which engages against the inner surface of flange 22 of the vturntable 2|land thus drives the turntable. Y

Ihe sound recording and reproducing apparatus may have a cutting stylus 3|! carried by a cutting arm 3| which may be raised out'of engagev ment with the surface of the turntable, or which may be lowered into engagement therewith,-in order to c ut a record 32 mounted upon the turntable 20. l

One form of mounting and drive of cutting arm 3| is shown in my application above mentioned. 'I'he cutting arm 3| may however be mounted in any suitable manner which may permit the same to be raised or lowered and which will kpermit the same to be driven radially as the record rotates in order to cut a spiral groove.

The pick-uparm 4|! carrying the needle 4| may' also be of conventional form and may be mounted upon the post 42 in a conventional manner so that the said arm may be raised or lowered into or out of engagement with the surface of the record 43. This arm is pivoted and freely rotatable to follow a spiral groove which has been cut into the surface of the record 43:

The only difference between the mounting of the pick-up arm l0 in the construction of the present invention and the mounting thereof in other structures is in the formation and operation of the post l2 hereinafter more specifically described. v

At present, there is no simple method by which a record' may be reproduced or copied on the ordinary recording machine without use of additional or duplicate apparatus. The duplicate turntable arrangement of the present invention permits this operation to' be performed on a single machine.

The additional turntable 50 may be secured to the turntable 20 in such a manner that operation ofthe turntable 20 may result in appropriate operation of the turntable 50.

The turntable is preferably mounted on and secured. to the post 5|,.which in turn is integrally connected to or otherwise mounted upon the pedestal 52. The pedestal 52, which furnishes the support vfor the turntable 50 has a central opening 54 in the bottom thereof, which may be mounted over the spindle 2| of the turntable 2l. A set-screw 55 may then be rotated into engagement with the spindle 2| to ensure the securing of the pedestal 52 to the spindle 2|.

Rotation of the turntable 20 and the of the spindle 2| will thus result in rotation of the pedestal 52 and consequently of the post 5|, which in turn will rotate the turntable 5U.

An additional point of securement may be obtained between the pedestal 52 and the turntable 20 by means of the spring pin v6|). Normally the spring pin 60 as well as the spindle 2| of the turntable 20 are used to position a record 32; but these same members may be used as shown more specifically in Fig. 2 in order to provide a proper drive between the turntable 20 and the turntable 53." l

The spring pin 60 is maintained in the position shown in Fig. 2 by a spring 6| which is secured to the under side of the turntable 20. This spring pin 63 normally registers with a perforation in the record 32 in order to ensure that the record 32 will rotate with the turntable 20.

The pedestal 52 however may also be provided with the perforation 65, which may register with the spring pin 60, in order to further secure the positive drive above mentioned.

The turntable 50 which is thus driven by the turntable also may have a spindle 10 for the o purpose of maintaining a record thereon, and, if desired, a spring pin 1|, in order to ensure a positive drive between the turntable 50 and the record 43.

Thus, it may be seen that the recording arm 3| may be brought into engagement with the record 32 on the turntable 20, while at the same time, the pick-up arm 40 is brought into engagement with the record 43 on the turntable 50. I

Theremainder of the apparatus may then be adjusted so that impulses transmitted from the record 43 to the pick-up arm 40 may be utilized to actuate the cutting stylus of the cutting arm 3| to cut the record 32.

It will be understood by those skilled in the art that by suitable switching means-the varnplifying circuit of the radio circuit employed in my phonographradio recording apparatus may be employed for receiving on the input thereof the impulses produced by the pick-up 40 of the record 43 which'impulses then are amplied and utilized for operating the cutting arm 3|. The same mechanical switching means may also be utilized to switch the output of the audio amplifier from the loud speaker to the cutting arm.

Other uses for a dual device of this type will, of course, be obvious. Thus, for instance, where records 43 are provided having an orchestral composition with one of the instrumental parts omitted so that the user of the record may play an instrument in accompaniment with the record; then the said record may be played as record 43 on turntable 50 and both the record itself and the users instrumental work may be recorded on record 32 on turntable 20.

Other uses and adaptations .of the dual turntable will, of course, be apparent.

The pick-up arm post 42 may be movable vertically in order to permit the pick-up arm 4l! to engage a record on theturntable 20 or a record on the turntable 50 when the additional turntable is mounted in place. For this purpose, the post 42 is slidable in its journal 80, while at the same time being rotatable therein. The post 42 may also have `two annular grooves 8| and 82 therein which may be engaged by the pin 83. When the pick-up arm 40 is to be used in the position shown in Fig. 2, the post 42 may be moved upwardly so 'that the annular groove 82 l thereof is engagedy the pin 83, in which case the post 42 is engaged against any further sliding movement while it may rotate in order to permit the pick-up arm 40 to follow the record. Should it be desired that the pick-up arm 4U operate on the principal turntable 20, then the ensagement of the pin 83 with the annular groove 82 may be released and the post 42 may be slid down so that the annular groove 3| is engaged by the pin.

Instead of an annular groove 3i, an abutment on the post may be used to bear against the top of the journal to maintain the position of the post. In operation, where it is desired to use the pick-up arm on the upper record and the cutting arm on the lower record, the cutting arm is iirst placed in position on the record of turntable 2li. The pedestal 52 is then secured over the spindle 2| of the spring pin 6| of the turntable 20, thus positioning the turntable 50 above the turntable 20. The record 43 is then "placed .on the turntable 50 and the pick-up arm 40 is placed so that the transcription needle rides in the groove of the record 43.

Thus the use of the apparatus may be enhanced simply by the provision of the additional turntable 50 mounted on a simple pedestal 52 which may be secured to the principal turntable 20 for operation thereby.

In the present structure, I have shown a modification of the mounting of the pick-up arm which will permit accurate reproduction despite the fact that the turntable 50 is mounted at a substantial height above the ordinary turntable position. Actually where the post 5I of pedestal 52 is short and in fact is suiciently high only to v provide clearance for the cutting arm 3|, it may be possible to use -the double turntable assembly with ordinary existing pick-uprarmmountings and thereby to adapt existing recording and reproducing apparatus to the double turntable operation herein described. v l

Many variations in the mounting and securement of the additional turntable to the principal turntable will now be obvious to those skilled in the art, and lmany variations of the double turntable arrangement will be obvious. In appropriate cases, the double turntable may be initially provided in sound recording and reproducing apparatus with proper means associated therewith to mount a record on the lower turntable and engage the record with either the cutting stylus or the pick-up needle.

Since these various uses and modifications of my invention should now be clear to those skilled in the art, I prefer to be bound not by the specific disclosures herein, but only by the appended claims.

I claim:

1. In sound apparatus,/ an auxiliary turntable for use in connection with a main turntable having a central vertical spindle and a pin extending vertically above thev surface thereof and spaced from said central spindle; said auxiliary turntable having a downwardly extending supporting post, the lower end of the post being provided with means interengaging and frictionally" retaining the spindle of the main turntable, and a ange-like portion extending horizontally from the lower end of said post for surface to surface engagement with said main turntable, said ange-like portion being provided with an opening engageable by said pin to form a positive drive connection from said main turntable to said auxiliary turntable.

2. An auxiliary turntable for use in connection with a main turntable having a central vehicle spindle and a pin extending vertically above the surface thereof and spaced from said central spindle; said auxiliary turntable, having a downwardly extending supporting post and an upwardly extending spindle, the lower end of the asados:

43. An auxiliary turntable for use in connection with amain turntable having a central vertical spindle and a pin extending vertically above the surface thereof and spaced from said central spindle; said auxiliary turntable having adownwardly extending supporting post and an upwardly extending spindle, the lower end oi' the post being provided with a central tubular vertical opening including means for intel-engaging and frictionally retaining thev spindle of the` main turntable. and a flange-like portion extending h'orizontally'from the` lower end of said post for surface to "surface engagement with said main turntable,A -said flange-like portion being provided with an opening engageable by said pin to form a positive drive connection from said main turntable to'said auxiliary turntable.

4.- An auxiliary turntable for use in connection with a main turntable having a centrall vertical spindle and a pin extending vertically above the surface thereof and spaced from said central spindle; said auxiliary turntable having a downwardly extending supporting post and an upwardly extending spindle. the spindle of said auxiliary turntable being an extension of said post, the lower end of the post being. provided with a central tubular vertical opening including means for inter-engaging and frictionally retaining the spindle of the main turntable, and a flange-like portion extending horizontally from the lower v end of said post for surface tosurface engagement with said v main turntable, said ange-like portion being provided with an opening engageable by said pin to form a positive driveconnection from said main turntable to said auxiliary turntable. v PAUL STEAD GAY. 

